Pile-driver hammer



Feb. IUQ 1925.

E. J. $ToNE FILE DRIVER HAMMER Filed June 13. 1922 I E R Patented Feb. 10, 1925.

UNITED STATES PATENT OFFICE.

EDWARD STONE, OF DULUTH, MINNEEQOTA; BURNICE STONE SOLE DEVISEE OF ESTATE OF SAID EDWARD J. STONE, DECEASED.

FILE-DRIVER HAMMER.

Application filed June. 13, 1922.

1 "o eZZ whom it may 0072.66??? Be it known that I, E nwann J. Sinus, a citizen of the United States, residing at Duluth, in the county of serene and State of Minnesota, have invented certain new and useful Improvements in Pile-Driver Hammers.

My invention relates to pile driver hammers, and has for its object the provision of a hammer equipped with elastic lifting or suspending means, whereby the strain of lifting the hammer is gradually applied and the wear and tear on the suspending sheaves, leads, and hoisting engine is greatly reduced. It consists of the constructions, combinations and arrangements ofw parts hereinafter described and claimed. f

In the drawings, Fig. 1, is a top plan view of a hammer embodying my invention. Fig, 2, is a central vertical section of said hammer. Fig. 3, is a top plan view of the hereinafter described foot plate, and Fig. 4: is a side elevation of said hammer.

In the drawings, 1 is the body portion of a hammer in the opposite sides of which are preferably formed vertically directed grooves 1 adapted to receive the hammer guides of a pile driver of any suitable structure (not shown). Formed in said hammer is a central vertically directed recess comprising a lower portion or spring chamber 1" and an enlarged upper portion or casting chamber 1. Positioned in said spring chamber, near the lower endthereof,'is a foot plate 4 having ears 4 formed thereon, which ears are adapted to extend into vertically directed guide grooves 1 formed in the side walls of said spring chamber, whereby said plate is prevented from turning.

Erected upon said foot plate is a helical compression spring 5, extendingin normal condition to the upper end of said spring chamber.

Lying in the bottom of the casting chamher and extending over said spring, is a casting 2 against which the upper end of said spring, is adapted to bear. A cup 2 adapted to hold a Babbitt metal bushig 2" is preferably formed upon the lower face of said casting and adapted to extend into the upper end of said spring. A bolt 3 headed at its lower end, and preferably of square cross section from its lower end upward for a suitable portion of its length, extends upwardly through a noncircular Serial No. 568,065.

dizlounted upon said casting and encircling said bolt is a cushion washer '7 of resllient structure or material, and a non-resilient washer 8, and secured to said bolt in threaded engagement therewith. Above said wasl ers is a nut 6, provided with an eye 6 adapted to engage a lifting hook or cable (not shown), of any suitable material or structure but forming no part of the present inventlon.

Extending through said hammer closely above said casting are bolts 9, 9 adapted to firmly hold said casting down against the upward thrust of said spring. Oil may be applied to the spring recess through any suitable port, as through the port 2 in said casting, and said recess may be drained through any suitable port as through the port 1, the outer end of which may be closed by a plug 1. Said hammer may be apertured in any suitable place or places as at 10, 10 10 for the purpose of engaging lifting, or handling rods or appliances (not shown), while a ssembling the apparatus, or if the normal lifting means should break, or upon certain other special occasions.

In operation, the usual lifting tackle (not shown-but well known to the art), is engaged with said eye 6 The hoisting strain being applied, said bolt 3 is drawn upwardly causing said foot plate to compress said spring which cushions the weight of hammer upon the hoisting apparatus, thus avoiding violent shock to said apparatus. hen the weight is released, the bolt and nut and foot plate are retracted suddenly by the expansion of said spring, but are cushioned by said cushion washer.

It is obvious, however, that my invention may be altered or modified in various particulars within the spirit and scope of certain of my claims.

lVhat I claim is:

1. In a pile driver hammer, the combination of a hammer body having a recess formed in its upper end, of a compression spring positioned in said recess, an abutment extending over said spring and secured to said body, a foot plate below said spring, said foot plate being engaged with said body portion to prevent the turning of said plate in a horizontal plane, a single shaft bolt extending through said foot plate, spring and abutment a bushing interposed between said bolt and said abutment, said plate being adapted to engage said bolt to prevent said bolt from turning in said plate, and an eye-nut secured to the upper end of said bolt.

2. In a pile driver hammer, the combination with a hammer body having a recess formed therein, of a spring positioned in said recess; an abutment positioned in said recess and extending over said spring; means for securing said abutment in said recess; a foot plate below said spring; a cushion Washer above said abutment; a bolt extending through said plate, spring, abutment and washer; and means secured to the upper end of said bolt for transmitting a lifting force thereto.

In testimony whereof, I hereunto aflix my signature, in presence of two witnesses.

EDWARD J. STONE. Witnesses:

JAMEs T. WATSON, WM. PHELPS. 

